Discharge mechanism for automatic firearms



N. MANCINI June 2,. i936. Y

DISCHARGE MECHANISM FOR AUTOMATIC FIKREARMS Filed May 26, 1935 Patented June 2, 1936 NITED STATES DISCHARGE MECHANISM FOR AUTOMATIC FIREARMS Niccolo Mancini, Florence, Italy Application May 26, 1933, Serial No. 672,930 In Germany February 28, 1933 6 Claims.

Automatic fire arms are known, comprising a double-armed locking lever the fore-arm of which is adapted to lock the bolt whilst the reararm retains the firing pin until the bolt is completely locked.

The present invention relates to a simplication in the discharge mechanism'of arms of this sort, consisting in that the reararm of the locking lever performs another function, namely, it is used as a hammer for actuating the ring pin.

A constructional embodiment of the invention is illustrated in the accompanying drawing, in which Fig. 1 is a view in longitudinal section showing the discharge mechanism in the normal or rest position,

Fig. 2 is a similar View showing the bolt in its extreme position directly after the discharge,

Fig. 3 is an enlarged view of a part of Fig. l i. e., showing the parts in the rest position,

Fig. 4 shows the same parts, but at the moment of discharge,

Fig. 5 is a sectional view through the doublearmed locking lever showing the hammer-retaining springs, and

Fig. 6 is a view similar to Fig. 5 with a somewhat different disposition of the parts.

In the drawing all parts which are not directly concerned with the locking and discharge mechanism according to the invention have been omitted. In all of the figures the same parts are indicated by the same reference numerals.

Referring now to the drawing, a double-armed locking lever I is rotatably mounted on a pivot 2 in the bolt casing 4, in such a manner that in rest position its fore-arm engages with a recess in the bolt 3 and locks the latter. The bolt casing can be moved to and fro in the box 5. On the rear-arm of the locking lever I a hammer 6, which operates the firing pin 8, is rotatably mounted on a pivot 'I. The hammer 5 is held in the rest position by the knobs I4 of the springs I4 (Figs. 5 and 6) which engage in recesses in the hammer, and released for discharge of the firearm by means of a trigger knob I5. which spreads the springs I4.

The operation of the device is as follows:

Assuming that the parts are in rest position, the hammer 6 is rigidly hooked to the stationary part of the rear-arm of the locking lever (Figs. 3 and 5) and the fore-arm of the locking lever locks the bolt (Fig. 3). When the knob I5 is pressed the springs I4 are spread. The knobs I4 therefore leave the recesses in the hammer, so that the tension spring I can pull the hammer 6 forward, causing the latter to strike against the ring pin 8 (Fig. 4) The nre-arm is, therefore, discharged.

The barrel, bolt casing and the bolt, with the double-armed locking lever, recoil therefore together for a certain distance. During this rearward movement the inclined surface of'a projection II integral with the cover of the box swings the locking lever I around the pivot 2 and at the same time causes the hammer 6 to 10 rotate around the axle l, so that the latter again snaps securely into engagement with the stationary part of the rear-arm of the locking lever, during compression of the spring 9, whilst the fore-arm of the locking lever releases the bolt.

As soon as the locking lever has released the bolt the spring I2 returns the barrel and the bolt casing; the bolt, however, continues its backward movement until the cartridge case is extracted and ejected from the barrel.

In its forward movement the bolt brings the next cartridge into the barrel, the fore-arm of the locking lever I is again rotated, by the spring I3, into engagement with the recess in the bolt. The bolt is therefore locked and the arm again ready for ring.

It is now possible to arrange for the arm to operate quite automatically, by that instead of the trigger knob I5 for spreading the springs I4 a wedge-shaped plate is brought by a trigger lever into the position normally occupied by the springs I4. It is clear that each time the locking lever fore-arm moves upwards, that is when it locks the bolt, the springs I4 are spread by the wedge-shaped plate, the hammer is released and a further cartridge is discharged. This lasts, whilst cartridges are available, so long as the wedge-shaped plate is held, by means of the trigger lever, in the operative position relative to the Y springs I4.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I de- Y clare that what I claim is:

1. In a discharge mechanism for automatic rire-arms, a bolt, a bolt-casing surrounding said bolt, a pivot carried by said bolt casing, a doublearmed locking lever rotatably mounted on said pivot, one arm of said locking lever being adapted to engage a recess formed in said bolt, whereby said bolt is locked, another pivot carried by the other arm of said locking lever, a hammer rotatably mounted on the second-mentioned pivot, and resilient means connected with said hammer and said locking lever.

2. A discharge mechanism for rautomatic re-fr arms, comprising a bolt, a bolt-casing surrounding saidy bolt, rapivot. carried by said bolt-casing, a double-armed locking lever rotatably rmounted,

0n said pivot,fone arm or" said locking lever being adapted to engage a recess formed in said bolt,

ment, whereby said locking lever is moved out orl f engagement with said boltr and said hammer is Yswung into .aninoperative position, and. means connected with said hammer for locking the same in said inoperative position.

i3. A discharge Ymechanism for automatic rearms, comprising a bolt, a bolt-casing surroundv ing said bolt, a ypivot carriedby said bolt-casing,

v a double-armed locking lever rotatably mounted on said pivot, one arm of said locking lever beingr 'adapted'to engage a recess Yformed in said bolt,

ywhereby saidy bolt islocked, a firing pin surrounded by said bolt, another pivot vcarriedl vby said locking lever, a hammer rotatably mounted yon the second-mentioned pivot, a spring connected with said hammer and said locking vlever and adapted to swing said hammer, whereby said hammer strikes against'sa'id iring pin, causing a discharge and a recoil `movement of'said Aboltcasing 'andfbolu 'abox surrounding said boltcasing and comprising a projection which is adapted to come in contact with said rlocking lever and said hammer during said recoil movement, whereby said locking Ylever is moved out of engagement with said bolt and said hammer is swung into an inoperative position, means connected with said hammer for locking the same in said inoperative position, and means adapted to come in Contact with the last-mentioned means to unlock said hammer.

4. A discharge mechanism for automaticl rirearms, comprising a bolt, a bolt-casing surrounding said bolt, a pivot carried by said bo1t-casing, a double-armed locking lever rotatably mounted on said pivot,one arm of said locking lever being adapted to engage a recess formed in said bolt, whereby said bolt is locked, a firing pin surrounded by said bolt, another pivot carried by said locking lever, a hammer rotatably mounted on the secondmentioned pivot, a spring conf nected with said hammer and said locking lever andadapted to swing said hammer, whereby'said hammer strikes against said ring pin, causing a discharge and arecoil movement of said boltto come in contact with said locking lever and f said hammer during said recoil movement, wherew bysad locking lever is moved out of engagement :with said bolt and said hammer is swung into an casing and bolt, a box surrounding said bolt-casf ing and `comprising a projection which is adapted inoperative position, means connected with said f hammer for locking the same in'said inoperativer position, and a trigger Wedge adapted to come in contact with the last-mentioned means to unlock said hammer.

5. yIn a discharge mechanism for automatic nre-arms, a bolt, a bolt casing surrounding said bolt, a pivot carried by said boltcasing,y a doublearmed lockingv lever rotatably mounted on said pivot, an arm of said l cking lever being adapted to engage said b-olt, Whereby'said bolt is lockedr to said casing, another pivot carried by an arm of said Vlocking lever, a hammer rotatably mounted on the rsecondmentioned pivot, and means vcoacting with said hammer whereby said hammer is actuated. f

6. In an automatic fire-arm of the recoiling A barrel breech mechanism type,fin combination with 'a' breech and a breech bolt; a pivot carried by the breech, a Vdouble-farmed locking ,levery swingably mounted on said pivot, said doublearmed :lever :having a foremost arm and a yrear- 

